CN115444551B - Radio frequency ablation electrode needle - Google Patents

Abstract

The invention relates to a radio frequency ablation electrode needle, and relates to the technical field of radio frequency ablation. The invention relates to a radio frequency ablation electrode needle, comprising: a needle cannula comprising an outer tube; a primary needle assembly movably disposed in the outer tube; the sub-needle assembly comprises at least two groups of sub-needles, and the at least two groups of sub-needles are respectively arranged between the main needle assembly and the outer tube and are distributed along the circumferential direction of the main needle assembly; the sub-needle assembly is configured such that at least one group of sub-needles can independently move along the axial direction of the main needle assembly to extend or retract the outer tube, so that the action range of the sub-needles can be independently controlled, for example, only a partial circumferential region of the main needle can be acted on, or the extending state of partial sub-needles can be changed into the retracting state and the retracting state of other sub-needles can be changed into the extending state in the ablation operation, so as to meet different treatment requirements in the ablation operation.

Description

Radio frequency ablation electrode needle

Technical Field

The invention relates to the technical field of radio frequency ablation, in particular to a radio frequency ablation electrode needle.

Background

The radio frequency ablation technology has the characteristics of small wound, quick recovery, few complications, obvious curative effect and the like, provides a new treatment way for clinicians and patients, and is widely applied at home and abroad at present. Radiofrequency ablation electrode needles used in radiofrequency ablation techniques, such as monopolar multi-needles, have been shown to be uncommon in clinical treatment of solid tumors. In the prior art, a plurality of sub-needles in the monopolar multi-needle radiofrequency ablation electrode needle can simultaneously extend out of a needle tube and uniformly spread in the circumferential direction of a main needle, so that the action range of the sub-needles is the whole circumferential area of the main needle, but in practical use, a plurality of target areas only need to be acted on partial circumferential areas of the main needle by the sub-needles; in addition, users also want to adjust the action area of the sub-needle as the operation progresses, and the prior art single-pole multi-needle radiofrequency ablation electrode needle cannot meet the use requirement.

Disclosure of Invention

The invention provides a radio frequency ablation electrode needle which is used for solving at least one technical problem.

The invention provides a radio frequency ablation electrode needle, comprising:

a needle cannula comprising an outer tube;

a primary needle assembly movably disposed in the outer tube; and

the sub-needle assembly comprises at least two groups of sub-needles, and the at least two groups of sub-needles are respectively arranged between the main needle assembly and the outer tube and are distributed along the circumferential direction of the main needle assembly;

the sub-needle assembly is configured such that at least one set of sub-needles therein can be independently moved in the axial direction of the main needle assembly to extend or retract the outer tube.

In one embodiment, the sub-needle assembly further includes at least two first motion control mechanisms, the at least two first motion control mechanisms are respectively correspondingly connected with the at least two groups of sub-needles, and the first motion control mechanisms respectively drive the corresponding sub-needles to move when moving along the axial direction of the main needle assembly.

In one embodiment, the first motion control mechanism includes a slide rail and a first slider, the first slider is respectively connected with the slide rail and the corresponding sub-needle, and the first slider can drive the corresponding sub-needle to move along the axial direction of the main needle assembly along the slide rail under the action of thrust so as to extend or retract the outer tube.

In one embodiment, the sub-needle assembly further comprises a second motion control mechanism, the second motion control mechanism is connected with all the sub-needles, and the second motion control mechanism converts circular motion into linear motion to drive the sub-needles to move.

In one embodiment, the second motion control mechanism comprises a first adjusting turntable and a second slider arranged inside the first adjusting turntable, the second slider is connected with all the sub-needles, and when the first adjusting turntable rotates along a first direction, the second slider is driven to drive all the sub-needles to move along the axial direction of the main needle assembly so as to extend out of the outer tube; when the first adjusting rotary disc rotates along the second direction, the second sliding block is driven to drive all the sub needles to move along the opposite direction so as to retract the outer tube.

In one embodiment, the primary needle assembly comprises:

the main needle is arranged at the front end of the outer tube, and a guide channel is formed between the main needle and the front end of the outer tube; and

a central tube in communication with the main needle, the central tube disposed in and coaxial with the outer tube;

the central tube drives the main needle to move in a direction away from the outer tube or in a direction close to the outer tube, so that the front end of the main needle is away from or close to the front end of the outer tube, and the guide channel is opened or closed;

wherein the sub-needle can protrude out of the outer tube when the guide channel is opened.

In one embodiment, the primary needle assembly further comprises a third motion control mechanism comprising a second dial and a third slider disposed inside the second dial, the third slider being connected to the central tube;

when the second adjusting rotary disc rotates along the first direction, the third sliding block is driven to drive the central tube and the main needle to move along the direction far away from the outer tube so as to open the guide channel; when the second adjusting rotary disc rotates along the second direction, the third sliding block is driven to drive the central tube and the main needle to move along the direction close to the outer tube so as to close the guide channel.

In one embodiment, the handle comprises a handle shell, the outer tube is connected with the handle shell, a dial is arranged on the handle shell, a pointer is further arranged on the second sliding block and used for pointing to scales on the dial so as to indicate the diameter of the sub needle extending out of the outer tube and then expanding.

In one embodiment, the injection device is communicated with the main needle and the sub-needle respectively;

the main needle is provided with a first dripping hole, the sub-needle is provided with a second dripping hole, liquid is respectively provided for the main needle assembly and the sub-needle through the liquid injection device, and the liquid reaches a designated area through the first dripping hole and/or the second dripping hole.

In one embodiment, the tip portion of the main needle is coated with an anti-adhesion coating.

In one embodiment, each of the main needle and the sub-needle is provided with a temperature thermocouple for detecting the temperature of the designated area, and the temperature thermocouples are electrically connected with a circuit switching board inside the handle shell.

In one embodiment, the handle shell is further provided with an indicator lamp for indicating the state of the radiofrequency ablation electrode needle, and the indicator lamp is electrically connected with a circuit adapter plate inside the handle shell.

In one embodiment, the circuit switching board is respectively connected with a radio frequency cable and a high frequency cable,

the radio frequency cable is used for being communicated with a radio frequency power supply;

the high-frequency wire is electrically connected with the main needle assembly and the sub-needle respectively.

In one embodiment, an indicator light is further arranged in the handle shell, and an aperture guide ring is arranged on the outer wall of the handle shell;

the indicating lamp is respectively connected with the circuit adapter plate and the light guide ring, and the light guide ring can guide the light emitted by the indicating lamp to the periphery of the handle shell.

Compared with the prior art, the invention has the advantages that at least one group of sub-needles in the sub-needle assembly can independently move along the axial direction of the main needle assembly to extend or retract the outer tube, so that the action range of the sub-needles can be independently controlled, for example, only partial circumferential regions of the main needle can be acted, or the extending state of partial sub-needles can be changed into the retracting state and the retracting state of other sub-needles can be changed into the extending state in the ablation operation, so as to meet different treatment requirements in the ablation operation.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the drawings.

FIG. 1 is a schematic view of a RF ablation electrode needle in one embodiment of the present invention, wherein the sub-needles are in a retracted state;

FIG. 2 is a partial cross-sectional view of a radio frequency ablation electrode needle with sub-needles in a retracted state in one embodiment of the invention;

FIG. 3 is an enlarged view of the handle housing shown in FIG. 2;

FIG. 4 is a schematic view of the structure of a radio frequency ablation electrode needle in one embodiment of the invention, wherein the sub-needles are all in an extended state;

FIG. 5 is a partial cross-sectional view of a radio frequency ablation electrode needle with sub-needles in an extended state in accordance with one embodiment of the present invention;

FIG. 6 is a schematic diagram of the structure of the pointer and dial in one embodiment of the present invention;

FIG. 7 is a state view showing the rear end of the main needle being away from the front end of the outer tube;

FIG. 8 is a schematic structural diagram of a liquid injection device according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a radiofrequency ablation electrode needle in one embodiment of the invention.

Reference numerals:

100. a needle tube; 110. an outer tube; 120. positioning the slip ring;

200. a primary needle assembly; 210. a main needle; 220. a central tube; 230. a third motion control mechanism; 240. a guide channel;

231. a second adjusting turntable; 232. a third slider; 233. a connecting member;

211. a first drip hole; 212. a main needle thermocouple;

311. a second drip hole; 312. a sub-needle thermocouple;

300. a sub-needle assembly; 310. a sub-needle; 320. a first motion control mechanism; 330. a second motion control mechanism;

321. a slide rail; 322. a first slider; 333. a limiting plate; 334. a pointer;

331. a first adjustment dial; 332. a second slider;

400. a handle housing; 410. a dial scale; 420. a line transfer board; 430. an indicator light; 440. a lamp strip support; 450. a light guide ring; 460. a radio frequency cable;

500. a liquid injection device; 510. a liquid injection pipe; 520. a liquid guiding tee joint; 530. a liquid storage module; 540. a catheter.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1, the present invention provides a radio frequency ablation electrode needle including aneedle tube 100, amain needle assembly 200, asub-needle assembly 300, and ahandle housing 400. Wherein theneedle cannula 100 includes anouter tube 110 having a scale disposed on an outer wall thereof. Theouter tube 110 has an insulating coating or is itself an insulating tube to be physically isolated from themain needle assembly 200 and thesub needle assembly 300. As shown in FIG. 1, a scale on theouter tube 110 is used to indicate the depth of insertion of theouter tube 110 into a designated area. Theouter tube 110 is further provided with apositioning slip ring 120 for controlling and prompting the depth of insertion of theouter tube 110 into a designated area.

Themain needle assembly 200 is movably disposed in theouter tube 110. Thesub needle assembly 300 includes at least two sets of sub needles 310, and the at least two sets of sub needles 310 are respectively disposed between themain needle assembly 200 and theouter tube 110 and distributed along the circumferential direction of themain needle assembly 200.

Example 1

As shown in fig. 9,sub-needle assembly 300 is configured such that at least one set ofsub-needles 310 therein can be independently moved in the axial direction ofmain needle assembly 200 to extend or retractouter tube 110, while at least another first set ofsub-needles 310 does not move (i.e., remains located inouter tube 110, sonon-moved sub-needles 310 are not visible in fig. 9). Wherein, the number of the sub-needles 310 in each group of the sub-needles 310 is at least one.

For example, thesub-needle assembly 300 includes 4 groups ofsub-needles 310, and each group ofsub-needles 310 is composed of 3 sub-needles 310. In other words, thesub-needle assembly 300 includes 12sub-needles 310 in total, and the 12sub-needles 310 are grouped into 4 groups. Or the 12sub-needles 310 in thesub-needle assembly 300 can be further divided into 2 groups, 3 groups, etc.

The advantage of grouping thesub-needles 310 in thesub-needle assembly 300 is that each group ofsub-needles 310 can independently move along the axial direction of themain needle assembly 200 to extend or retract theouter tube 110. For example, only the first group ofsub-needles 310 may be moved in the axial direction of themain needle assembly 200 to protrude the outer tube 110 (as shown in fig. 9), while the remaining 3 groups ofsub-needles 310 are not moved, so that the sub-needles 310 protruding out of theouter tube 110 are only within 90 ° of the circumference of themain needle assembly 200, thereby being applicable to ablation operation of a specific region.

It is understood that the grouping form of thesub-needle assemblies 300 may be the even-dividing form described above, or thesub-needle assemblies 300 may also be the uneven-dividing form, for example, thesub-needle assemblies 300 include 12 sub-needles, wherein one group ofsub-needles 310 is composed of 3sub-needles 310, and the other 3 groups ofsub-needles 310 are respectively composed of 2sub-needles 310, 3sub-needles 310 and 4sub-needles 310. In addition, thesub-needle assembly 300 may further include other numbers ofsub-needles 310, for example, 2, 4, 6, 8, 10sub-needles 310, etc., and the number may be singular or even, which is not described in detail herein.

Thesub-needle assembly 300 further includes at least two firstmotion control mechanisms 320, the at least two firstmotion control mechanisms 320 are respectively and correspondingly connected to the at least twosub-needles 310, and the firstmotion control mechanisms 320 respectively drive the correspondingsub-needles 310 to move when moving along the axial direction of themain needle assembly 200.

It will be appreciated that the firstmotion control mechanisms 320 correspond to the grouping ofsub-needles 310, in other words, sub-needles 310 are divided into groups, and should correspond to the same number of firstmotion control mechanisms 320. As described above, if the sub-needles 310 are divided into 4 groups, there should be 4 firstmotion control mechanisms 320. Each of the firstmotion control mechanisms 320 is connected to acorresponding sub-needle 310 of the set, thereby controlling the independent motion of thesub-needles 310 of the set.

Specifically, the firstmotion control mechanism 320 includes a slidingtrack 321 and afirst slider 322, thefirst slider 322 is respectively connected to the slidingtrack 321 and the corresponding sub-needle 310, and thefirst slider 322 drives the corresponding sub-needle 310 to move along the axial direction of themain needle assembly 200 along the slidingtrack 321 under the action of a thrust force so as to extend or retract theouter tube 110.

Thefirst slider 322 can control the extending length and the expanding diameter of the sub-needle 310, and the longer the sub-needle 310 extends out of theouter tube 110, the larger the expanding diameter; conversely, the smaller the deployed diameter.

A portion of thefirst slider 322 may be located outside thehandle housing 400 to facilitate the application of force by the user.

It is envisaged that thefirst slider 322 is provided with a locking mechanism, which may be in the form of a spring-locked button or the like, for locking thefirst slider 322 and the slidingrail 321 to each other. When the locking mechanism is unlocked, thefirst slider 322 can slide on the slidingrail 321, and when the locking mechanism is locked, thefirst slider 322 is locked on the slidingrail 321, so that when thefirst slider 322 moves to a certain position, it can be fixed at the position, and the sub-needle 310 can extend out of the required length.

It is also contemplated that the firstmotion control mechanism 320 includes a rotary member provided with a plurality of steps spirally rising in the axial direction, each step being connected to each set ofsub-needles 310, respectively. So that when the rotating member rotates through a certain angle (e.g., 90 °) in a first direction (e.g., clockwise), the first group ofsub-needles 310 can be driven to move along the axial direction of themain needle assembly 200 to extend out of theouter tube 110. After one rotation of the rotating member, each set ofsub-needles 310 can be extended out of theouter tube 110. When the rotating member is rotated in a second direction (e.g., counterclockwise) opposite to the first direction, the groups ofsub-needles 310 may be sequentially retracted into theouter tube 110.

Example 2

Thesub-needle assembly 300 is configured such that all thesub-needles 310 thereof move in the axial direction of themain needle assembly 200 to extend or retract theouter tube 110.

Specifically, as shown in fig. 2 and 3, thesub-needle assembly 300 further includes a secondmotion control mechanism 330, the secondmotion control mechanism 330 is connected to all the sub-needles 310, and the secondmotion control mechanism 330 converts a circular motion into a linear motion to drive thesub-needles 310 to move.

As shown in fig. 3, the secondmotion control mechanism 330 includes afirst adjusting dial 331 and asecond slider 332 disposed inside thefirst adjusting dial 331, wherein an outer thread is disposed on an outer wall of thesecond slider 332, and the second slider is in threaded connection with an inner thread on an inner wall of thefirst adjusting dial 331, so that thesecond slider 332 and thefirst adjusting dial 331 form a lead screw mechanism.

By connecting thesecond slider 332 to all the sub-needles 310, when thefirst adjusting dial 331 rotates in the first direction, thesecond slider 332 is driven to drive all the sub-needles 310 to move along the axial direction of themain needle assembly 200 to extend out of the outer tube 110 (as shown in fig. 4 and 5); conversely, when thefirst adjustment dial 331 rotates in the second direction, thesecond slider 332 is driven to drive all the sub-needles 310 to move in the opposite direction to retract the outer tube 110 (as shown in fig. 2 and 3).

The external thread of thesecond slider 332 and the internal thread of thefirst adjusting dial 331 are self-locking threads, so that when thesecond slider 332 moves to a certain position, thesecond slider 332 and thefirst adjusting dial 331 can realize self-locking.

As shown in fig. 2, at least a portion of thefirst adjustment dial 331 is exposed outside thehandle housing 400 to facilitate rotation by an operator. Wherein, the outer wall of thefirst adjusting turntable 331 can be provided with anti-slip stripes or anti-slip bumps to improve the gripping force.

As shown in fig. 3, the secondmovement control mechanism 330 is disposed in thehandle housing 400 at a rear end position, so that the rear end of thesub needle 310 extends from theouter tube 110 into thehandle housing 400 and is connected (e.g., adhesively connected) to thesecond slider 332.

Thefirst adjustment dial 331 can control the extension length and the extension diameter of thesub needle 310, and the longer thesub needle 310 extends out of theouter tube 110, the larger the extension diameter; conversely, the smaller the deployed diameter.

On the basis of the two embodiments 1 and 2 described above, themain needle assembly 200 includes themain needle 210 and thecentral tube 220. Wherein themain needle 210 is disposed at the front end of theouter tube 110, and a guide channel 240 (shown in fig. 5) is formed between themain needle 210 and the front end of theouter tube 110. Acenter tube 220 communicates with themain needle 210, and thecenter tube 220 is disposed in theouter tube 110 and coaxially disposed with theouter tube 110. Thecenter tube 220 also extends into thehandle housing 400 and is connected to a thirdmotion control mechanism 230, described below.

Thecentral tube 220 carries themain needle 210 in a direction away from theouter tube 110 or in a direction close to theouter tube 110, so that themain needle 210 moves away from or close to the front end of theouter tube 110, thereby opening theguide channel 240 or closing theguide channel 240.

Since the rear end of themain needle 210 has a substantially uniform outer diameter with the front end of theouter tube 110, as shown in fig. 2, when the rear end of themain needle 210 abuts the front end of theouter tube 110, theguide passage 240 is closed, and thesub needle 310 cannot be protruded from theouter tube 110. On the contrary, as shown in fig. 7 (thesub needle 310 is not shown in fig. 7), when themain needle 210 is pushed to the rear end thereof to be separated from the front end of theouter tube 110, so that a slit with a width L, i.e., aguide channel 240, may be formed between the rear end of themain needle 210 and the front end of theouter tube 110, thesub needle 310 may protrude out of theouter tube 110 through theguide channel 240.

Through the arrangement of theguide channel 240, the sub-needle 310 can be supported by themain needle 210 and thecentral tube 220 when extending out of theouter tube 110, and the sub-needle 310 can act as a fulcrum of force, so that the sub-needle 310 has stronger force in the puncturing process after extending out, and the arrangement is particularly important for the ablation operation of some special areas (such as lesion parts and harder lesion nodules of patients with cirrhosis). In addition, thesub-needles 310 can be uniformly extended out without changing the direction by relying on themain needle 210 and thecentral tube 220, so that the electric conduction is stable, stable and uniform electric field heat is realized, the thorough execution of the ablation operation is facilitated, and the omission of the ablated tissue is prevented.

Before performing the ablation procedure, the sub-needle 310 is fully retracted within theouter tube 110 and theguide channel 240 is closed. After themain needle 210 pierces the proper position of the lesion tissue, the guidingchannel 240 is opened, and the sub-needle 310 is deployed to a proper length and diameter according to the actual requirement (the deployed size of the sub-needle 310 can be confirmed by referring to thepointer 334 on the dial 410).

As shown in fig. 2 and 3, themain needle assembly 200 further includes a thirdmotion control mechanism 230, and the thirdmotion control mechanism 230 includes asecond dial 231 and athird slider 232 disposed inside thesecond dial 231, thethird slider 232 being connected to thecentral tube 220. The outer wall of thesecond adjusting turntable 231 is provided with an external thread, which is similar to thefirst adjusting turntable 331, and the inner wall of the second adjusting turntable is also provided with an internal thread, and thethird slider 232 is in threaded connection with the internal thread, so that thethird slider 232 and thesecond adjusting turntable 231 also form a screw mechanism.

When thesecond adjusting dial 231 rotates in the first direction, thethird slider 232 is driven to move thecentral tube 220 and themain needle 210 in a direction away from theneedle tube 100 to open the guiding channel 240 (at this time, the rear end of themain needle 210 is away from the front end of the outer tube 110); conversely, when thesecond adjustment dial 231 rotates in the second direction, thethird slider 232 is driven to move thecentral tube 220 and themain needle 210 in a direction close to theneedle tube 100 to close the guiding channel 240 (at this time, the rear end of themain needle 210 abuts against the front end of the outer tube 110).

The external thread of thethird slider 232 and the internal thread of thesecond adjusting turntable 231 are self-locking threads, so that when thethird slider 232 moves to a certain position, thethird slider 232 and thesecond adjusting turntable 231 can realize self-locking.

In addition, thecentral tube 220 extends into thehandle housing 400 and is connected to thethird slider 232 through the connectingmember 233, so that thethird slider 232 can move thecentral tube 220 and themain needle 210.

The stroke of thethird slider 232 is limited by the limit blocks at the front end and the rear end thereof, respectively.

As shown in fig. 2, at least a portion of thesecond adjustment dial 231 is exposed outside thehandle housing 400 to facilitate rotation by an operator. Wherein, the outer wall of thesecond adjusting turntable 231 can be provided with anti-slip stripes or anti-slip bumps to improve the gripping force. Further, thesecond adjustment dial 231 is closer to the front end of thehandle housing 400 than thefirst adjustment dial 331 to meet the operation habit.

By controlling the movement of themain needle 210 and the sub-needle 310 independently through thesecond adjustment dial 231 and the first adjustment dial 331 (or the first slider 322), respectively, any control of the extension or retraction of the sub-needle 310 can be realized, so that the ablation operation of lesion areas with different sizes can be adapted.

And the linear motion of themain needle 210 and thesub needle 310 is driven by the circular motion of rotating thesecond adjustment dial 231 and thefirst adjustment dial 331, the operation thereof is simpler and smoother.

It should be noted that the sub-needle 310 is made of a memory alloy material with high elasticity and strength and good recovery, so that the sub-needle 310 will have a tree-like or umbrella-like (also called an anchor-like) structure after extending out of theouter tube 110.

Theneedle cannula 100 is connected to thehandle housing 400, and in particular, theouter tube 110 may be fixed to the front end of thehandle housing 400. Thecenter tube 220 may extend into thehandle housing 400 and connect to aconnector 233 in thehandle housing 400.

As shown in fig. 6, thehandle housing 400 is provided with adial 410, and thesecond slider 332 is further provided with apointer 334, wherein thepointer 334 is used for pointing to the scale on thedial 410 to indicate the diameter (or radius) of the sub-needle 310 expanded after extending out of theouter tube 110. The scale on thedial 410 is related to the number of turns and strokes thesecond slider 332 has made.

When thesecond slider 332 moves, thepointer 334 can be moved. When thesecond slider 332 is moved to a different position, thepointer 334 is indicated on a different scale on thedial 410. Thus, the deployed size ofsub-needle 310 may be confirmed based on the pointer assistance ondial 410 while performing the ablation procedure.

Thehandle housing 400 is provided with aliquid injection device 500, and theliquid injection device 500 is respectively communicated with themain needle 210 and the sub-needle 310.

As shown in fig. 5, themain needle 210 has a hollow liquid passage inside, which communicates with theliquid injection device 500. The interior of the sub-needle 310 also has a hollow fluid passage, which is in communication with theinjection device 500. Referring to fig. 7, afirst drip hole 211 is formed at a tip of themain needle 210. The needle tip of the sub-needle 310 is provided with asecond drip hole 311. Liquid is respectively supplied into themain needle assembly 200 and the sub-needle 310 through theliquid injection device 500 and reaches a designated area through the firstliquid dropping hole 211 and/or the secondliquid dropping hole 311, so that the conductivity can be increased, and the ablation area can be enlarged.

The liquid provided to themain needle 210 and the sub-needle 310 may be a liquid medicine or a mixed ablation agent of absolute alcohol, glacial acetic acid and diluted hydrochloric acid, and the liquid may provide a chemical ablation effect to consolidate the curative effect and make the ablation operation more thorough.

Specifically, as shown in fig. 5 and 8, thepriming device 500 includes apriming tube 510, adrainage tee 520, areservoir module 530, and acatheter 540. Theliquid injection pipe 510 is connected with one port of theliquid guide tee 520, and the other two ports of theliquid guide tee 520 are respectively connected with theliquid storage module 530 and theliquid guide pipe 540. Thereservoir module 530 is disposed on thesecond slider 332 and moves with thesecond slider 332.

Theprimary needle 210 communicates with thereservoir module 530 through acentral tube 220, as shown in FIG. 8, thecentral tube 220 extending into the reservoir module 530 (or alternatively through the reservoir module 530). The rear ends of all the sub-needles 310 also extend into thereservoir module 530 to communicate therewith. The connection between thecentral tube 220 and the sub-needle 310 and theliquid storage module 530 is provided with a sealing element to ensure the sealing performance.

As shown in FIG. 8, thecatheter 540 is helically disposed on the central tube 220 (forming an ordered coil) and is in communication with thereservoir module 530. Through the liquid injection port of theliquid injection tube 510, physiological saline or medicine can be injected into the sub-needle 310 and themain needle 210, and injected into the ablated tissue through the firstliquid drop hole 211 on the needle tip of themain needle 210 and/or the secondliquid drop hole 311 on the needle tip of the sub-needle 310, so as to increase the ablation area, consolidate the treatment effect and achieve the effect of coagulating necrotic lesion tissue. The injected drug or other composition fluid may then allow for chemical ablation, providing more options for clinical MDT treatment options.

In addition, theinjection device 500 further includes a sealing member or a sealing ring between the components to perform a sealing function.

The tip portion of themain needle 210 is coated with an anti-adhesion coating, which has a stronger conductive effect during ablation; and the needle withdrawal is more facilitated after the ablation operation is finished. The tip of themain needle 210 is constructed in a bevel shape, a conical shape, or a triangular pyramid shape to ensure penetration of hard lesion tissue.

Temperature thermocouples (e.g., armor thermocouples) for detecting the temperature of a designated area are provided on both themain needle 210 and the sub-needle 310, and are electrically connected to theline switching board 420 inside thehandle case 400. Themain needle thermocouple 212 on themain needle 210 is arranged in the needle tip cavity, the highest temperature of the ablation central point can be measured in real time in the radio frequency ablation process, the area is also the place with the most dense conductive flow, when the temperature exceeds 100 ℃ (the temperature exceeds the boiling point of water), the tissue can be dehydrated, scabbed and carbonized to generate adhesion, so that the temperature of the ablation central point needs to be controlled not to be too high, and the method is very important for obtaining the thorough treatment of the ablation area.

Thesub-needle thermocouple 312 on the sub-needle 310 is arranged at the position of the tip end of the sub-needle, and thesub-needle thermocouple 312 can monitor and feed back the temperature of the tumor margin and can be used for providing reference for real-time evaluation of treatment effect and implementation of a comprehensive treatment scheme.

The tail ends of the temperature thermocouple on themain needle 210 and the thermocouple on thesub needle 310 are connected with theline adapter plate 420, so that the monitored temperature data is transmitted to the main control equipment through theline adapter plate 420, and the tissue temperature of the ablation target area is monitored and controlled in real time. Through the control of the main control equipment, each temperature measuring point can be randomly selected as a temperature control point, so that the phenomena of scabbing, charring and the like can be prevented, and the phenomenon of omission caused by insufficient temperature at the edge of a tumor can be prevented. Therefore, the sub-needle 310, themain needle 210 and the main control device can form a combined real-time temperature measurement and control system, which not only ensures the effective and proper temperature of the treatment area, but also can process the safe distance relationship between the ablation area and the surrounding normal tissues and important organs.

As shown in fig. 2, anindicator light 430 for indicating the status (e.g. working status or non-working status) of the rf ablation electrode needle is further disposed on thehandle housing 400, and theindicator light 430 is electrically connected to thecircuit adapter plate 420 inside thehandle housing 400. Theindicator light 430 is also connected to alight guide ring 450 on the outer wall of thehandle case 400, and thelight guide ring 450 guides the light emitted from the indicator light 430 to the circumferential direction of thehandle case 400, so that a light display is generated in one circumferential circle of thehandle case 400. Therefore, when theindicator light 430 is on, the light is displayed on the circumferential direction of thehandle shell 400 through the guidance of thelight guide ring 450, so as to indicate that the radiofrequency ablation electrode needle is in a working state; when theindicator light 430 is turned off, the circumferential direction of thehandle shell 400 does not emit light to indicate that the radiofrequency ablation electrode needle is in a non-working state.

In addition, theline adapter board 420 can also control the indicator light 430 to display in other manners, for example, theindicator light 430 is controlled to flash, and the like, which can indicate that the rf ablation electrode needle is in a fault state.

Theline patch panel 420 is connected with aradio frequency cable 460 and a high frequency line respectively, theradio frequency cable 460 is connected with a radio frequency power supply through a radio frequency plug, and the high frequency line is electrically connected with themain needle 210 and the sub-needle 310 respectively.

In the present invention, the "axial direction" refers to the X-axis direction shown in fig. 1, where the "front end" refers to an end close to the designated area, and the "rear end" refers to an end away from the designated area and close to the rf power source.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (9)

1. A radio frequency ablation electrode needle, comprising:

a needle cannula (100) comprising an outer tube (110);

a primary needle assembly (200) movably disposed in the outer tube (110); and

a sub-needle assembly (300), wherein the sub-needle assembly (300) comprises at least two groups of sub-needles (310), and the at least two groups of sub-needles (310) are respectively arranged between the main needle assembly (200) and the outer tube (110) and distributed along the circumferential direction of the main needle assembly (200);

the sub-needle assembly (300) is configured such that at least one set of sub-needles (310) therein can be independently moved in the axial direction of the main needle assembly (200) to extend or retract the outer tube (110);

the sub-needle assembly (300) further comprises a first motion control mechanism (320), the first motion control mechanism (320) comprises a rotating piece, the rotating piece is provided with multiple steps which spirally ascend along the axial direction, each step is respectively connected with each group of sub-needles (310), when the rotating piece rotates for a certain angle along the first direction, the rotating piece can drive the first group of sub-needles (310) to move along the axial direction of the main needle assembly (200) so as to extend out of the outer tube (110), and after the rotating piece rotates for a circle, each group of sub-needles (310) can extend out of the outer tube (110); each set of sub-needles (310) may be sequentially retracted into the outer tube (110) when the rotating member is rotated in a second direction opposite to the first direction;

the primary needle assembly (200) comprises:

a main needle (210), the main needle (210) being disposed at a front end of the outer tube (110),

a central tube (220) in communication with the primary needle (210); and

the third motion control mechanism (230) comprises a second adjusting turntable (231) and a third sliding block (232) arranged inside the second adjusting turntable (231), the third sliding block (232) is connected with the central tube (220), and the third sliding block (232) can drive the central tube (220) and the main needle (210) to move;

the external thread on the third sliding block (232) and the internal thread on the second adjusting turntable (231) are self-locking threads.

2. The radio frequency ablation electrode needle according to claim 1,

a guide channel (240) is formed between the main needle (210) and the front end of the outer tube (110);

the central tube (220) is disposed in the outer tube (110) and coaxially with the outer tube (110);

the central tube (220) carries the main needle (210) to move in a direction away from the outer tube (110) or in a direction close to the outer tube (110), so that the front end of the main needle (210) leaves or is close to the outer tube (110), thereby opening the guide channel (240) or closing the guide channel (240);

wherein the sub needle (310) can protrude out of the outer tube (110) when the guide passage (240) is opened.

3. The radio frequency ablation electrode needle according to claim 2,

when the second adjusting turntable (231) rotates along a first direction, the third sliding block (232) is driven to drive the central tube (220) and the main needle (210) to move along a direction away from the outer tube (110) so as to open the guide channel (240); when the second adjusting turntable (231) rotates along a second direction, the third slider (232) is driven to drive the central tube (220) and the main needle (210) to move along a direction close to the outer tube (110) so as to close the guide channel (240).

4. The radiofrequency ablation electrode needle of claim 2, further comprising an infusion device (500), wherein the infusion device (500) is respectively communicated with the main needle (210) and the sub-needle (310);

the main needle (210) is provided with a first liquid dropping hole (211), the sub-needle (310) is provided with a second liquid dropping hole (311), liquid is respectively provided for the main needle assembly (200) and the sub-needle (310) through the liquid injection device (500), and the liquid reaches a designated area through the first liquid dropping hole (211) and/or the second liquid dropping hole (311).

5. A radio frequency ablation electrode needle as claimed in claim 2, wherein the tip portion of the main needle (210) is coated with an anti-stiction coating.

6. The radiofrequency ablation electrode needle of claim 1, wherein the main needle (210) and the sub-needle (310) are provided with temperature thermocouples for detecting the temperature of a designated area, and the temperature thermocouples are electrically connected with a line switching plate (420) inside the handle housing (400).

7. The radiofrequency ablation electrode needle as claimed in claim 1, wherein an indicator light (430) for indicating the state of the radiofrequency ablation electrode needle is further arranged on the handle housing (400), and the indicator light (430) is electrically connected with a circuit adapter plate (420) inside the handle housing (400).

8. The RF ablation electrode needle according to claim 7, wherein the circuit adapter plate (420) is connected with an RF cable (460) and a high frequency cable respectively,

the radio frequency cable (460) is used for connecting a radio frequency power supply;

the high frequency lines are electrically connected with the main needle assembly (200) and the sub-needle (310), respectively.

9. The radio frequency ablation electrode needle according to claim 6, wherein an indicator light (430) is further arranged in the handle shell (400), and an aperture guide ring (450) is arranged on the outer wall of the handle shell (400);

the indicator light (430) is respectively connected with the line adapter plate (420) and the light guide ring (450), and the light guide ring (450) can guide the light emitted by the indicator light (430) to the circumferential direction of the handle shell (400).

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